Question

I have a PostgreSQL 9.1 database in which pictures are stored as large objects.
Is there a way to export the files to the clients filesystem through an SQL query?

select lo_export(data,'c:\img\test.jpg') from images where id=0;

I am looking for a way similar to the line above, but with the client as target.
Thanks in advance!

Answer 1

this answer is very late but will be helpful so some one i am sure

To get the images from the server to the client system you can use this

"C:\Program Files\PostgreSQL\9.0\bin\psql.exe" -h 192.168.1.101 -p 5432 -d mDB -U mYadmin -c  "\lo_export 19135 'C://leeImage.jpeg' ";

Where

1. h 192.168.1.101 : is the server system IP
2. -d mDB : the database name
3. -U mYadmin : user name
4. \lo_export : the export function that will create the image at the client system location
5. C://leeImage.jpeg : The location and the name of the target image from the OID of the image
6. 19135 : this is the OID of the image in you table.

the documentation is here commandprompt.com